Apple changes name of 'Free' button on App Store to 'Get'
Back in July, Google made a deal with the European Commission to stop calling apps "free" if they offered in-app purchases. That came months after both Apple and Google met with EC commissioners. The latter were trying to get Apple and Google to halt misleading freemium app sales. The EC subsequently tried to get Apple to match Google's actions, but Apple said at the time that it had enough safeguards in place to protect consumers.
One of those safeguards, which is shared by Google, is a listing of which apps offer in-app purchases. Those that do offer in-app purchases on both the App Store and Google Play Store, show a 'menu' of in-app purchases available to those who install the app for free.
source: MacRumors via RedmondPie